Router-bit.



G. SGHROEPFER.

ROUTER BIT.

APPLICATION FILED 15.23.23, 1909.

mnntoz Patented Feb. 8, 1910.

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mkwww ANDREW & GRAHAM 00 mmo-umosnAPusns. WASHINGTON. D. c.

CASPER SCHROEPFER, 0F DAVENPORT, IOWA.

' ROUTER-BIT.

Specification of Letters Patent.

Patented Feb. S, 1910.

Application filed April 23, 1909. Serial No. 491,666.

To all whom it may concern:

Be it known that I, CASPER SoHnoEPFER, a citizen of the United States,residing at Davenport, in the county of Scott, State of Iowa, haveinvented certain new and useful Improvements in Router-Bits; and I dohereby declare the following to be a full, clear, and exact descriptionof the invention, such as will enable others skilled in the artto whichit appertains to make and use the same.

This invention relates to carpenter tools and has special reference to anovel form of router bit.

One object of the invention is to provide a router bit with a detachablepoint so that the latter may be renewed or replaced without making itnecessary to replace the entire shank.

A second object of the invention is to construct a router bit with adetachable point so that the shank may be made of an inferior grade ofmaterial while the point i may be manufactured of a high grade of toolsteel.

A third object of the invention is to provide a router bit with a shankhaving a detachable point so arranged that the point may be held inalinement with the shank for the purpose of sharpening the same.

A fourth object of the invention is to provide a router bit with a shankhaving its upper end slotted for the reception of the bit point whendetached from the lower end of the shank so that said bit point may beheld in proper position for sharpening.

lVith the above and other objects in view the invention consists ingeneral of a router bit provided with a shank having a detachable pointsecured thereto.

The invention further consists in certain novel details of constructionand combinations of parts hereinafter fully described, illustrated inthe accompanying drawings,

and specifically set forth in the claims.

In the accompanying drawings, like characters of reference indicate likeparts in the several views, and Figure 1 is a side elevation of one formof this invention. Fig. 2 is a top plan view thereof. Fig. 3 is a viewof Fig. 1 with the bit point arranged in alinement with the shank forthe purpose of sharpening the same. Fig. 4: is a view of a modificationof the invention. Fig. 5 is another view of this modification with thebit point held in the upper end of the shank.

Fig. 6 is a perspective View of the bit point removed from the shank.

The numeral 10 indicates the shank of a router bit as constructed inaccordance with this invention. It is a well known fact that in alldevices of this character commonly used the shank of the bit is in theform of a square prism having its edges squared off and that it isarranged in the router with the diagonal of the square held in thedirection of movement of said router. The present shank has thereforebeen shown of this description. At the bottom of this shank there isprovided a forward extension 11 and this forward extension consists of apair of spaced arms the opening between which is continued through thebottom of theshank as at 12. There is thus formed in the bottom of theshank a through slot. At 13 is a bit point and this bit point is of theusual wedge shape and is further provided with a rearwardly extendingtongue 1 1 which is adapted to closely fit in the through slot 12 Whilethe shoulders 15 between the body 13 and the tongue 141 fitup againstthe front edges of the forwardly extending members of the shank 10. Ascrew 16 passes through the shank and the tongue let and serves to holdthe bit point firmly in position. The tongue 1-1 is further providedwith a slotted recess 17 and a pin 18 passes through the lower end ofthe shank and enters this slot, the purpose of the pin and slot being toassist in holding the bit point 13 in proper position on the shank 10.In the form of the device shown in Figs. 1 and 5 the shank is furtherprovided with a through slot 19 having suitable screw receivingapertures 20 extending through the shank on either side thereof. Thescrew 16 is countersunk into the shank and is of just suflicient lengthto come flush with the other side so that it does not contact with thematerial being routed.

In the form shown in Figs. 1 and 8 when it is desired to put the bit inposition for sharpening it is simply necessary to remove the pin 18 andthe screw 16 when the pin may be turned into the position shown in Fig.3 and the screw reinserted. In this position the back edge of the tongue1 1 will bear against the upper end of the slot 12 and the bit will beheld rigidly so that it may be applied to a grind-stone as indicated bythe curved line below the bit in Fig. 3 thus permitting itto be groundin the same manner as an ordinary chisel. Furthermore IOU the bit may bewhetted on a whet stone in the same manner as a common chisel.

In the form shown in Figs. 4 and 5 when it is desired to sharpen the bitit is removed from the lower slot 12 and placed in the upper slot 19 asclearly shown in Fig. 5. In this position it may be treated exactly asthe bit shown in Fig. 3.

There has thus been provided a simple and efiicient device of the kinddescribed and for the purpose specified.

It is to be observed that by this construction the bit, beingdetachable, may be made of a high grade of tool steel while the shankmay be made of a low grade of material and that the bit is held on theshank without rendering it necessary to force the same together andnecessitating the throwing away of the entire tool should the pointbecome badly nicked or broken.

In order that the sides of the shank may be more readily drawn togetherthe slot in the bottom thereof is extended upward as shown at 21.

Having thus described the invention, what is claimed as new, is z 1. Ina bit, a shank provided with a forwardly extending projection comprisinga pair of spaced arms and further provided with a slot forming acontinuation of the space between said arms, a cutting point having anend fitting said slot, and means for attaching the point to the shank tohold the point to project laterally from the shank or in alinementthereto.

2. In a bit, a shank provided with a forwardly extending projectioncomprising a pair of spaced arms, and further provided with a slotforming a continuation of the space between said arms, a cutting pointprovided with a reduced tongue held within the slot and the spacebetween said arms, and forming. shoulders bearing against the ends ofthe arms, and means for attaching the point to the shank to hold thepoint to project laterally from the shank or in aline ment thereto.

3. In a bit, ashank provided with a forwardly extending projectioncomprising a pair of spaced arms and further provided with a slotforming a continuation of the space between said arms, a cutting pointprovided with an end fitting said slot, means to hold said cutting pointto project laterally from the shank in said slot, said shank beingprovided with a second slot in the opposite end thereof, and means tohold said point to project from the last mentioned slot in alinementwith the shank. v

4:. In a bit, a shank provided with a forwardly extending projectioncomprising a pair of spaced arms and further provided with a slotforming a continuation of the space between said arms and a slot at theopposite end thereof arranged in angular relation to the first mentionedslot, a cutting point provided with a reduced tongue adapted to be heldwithin either of said slots, said tongue forming shoulders to bearagainst the ends of said arms whenthe point is held in the firstmentioned slot, and means to hold the point to project laterally fromthe first mentioned slot and in alinement with the shank from the secondmentioned slot.

In testimony whereof, I am); my signature. in presence of two witnesses.

CASPER SCHROEPFER.

lVitnesses GEO. BUTENSCI-IOEN, L. M. FISHER.

